If it fits, I'll need to carefully enlarge the speaker mounting hole in the baffle. Based on my measurements it's going to be real close. I ordered a 10" Weber Blue pup that I am hoping to shoehorn into the cab. Just trying to get that B+ up a bit higher. The 81 provided about 7 VDC more plate voltage than the EZ80. Large Genuine Vox Logo, Gold Plated Plastic - as used on the AC-30 combo amplifier and many Vox speaker cabinets. I say rectifiers because I ended up using an EZ81 rectifier instead of the EZ80. I slapped in an RCA 12AX7, RFT EF86, and a 80s Reflektor era 6N14EP I had laying around. I wanted an amp that I could unabashedly ravage without worrying about the consequences. I had all the tubes except the rectifier. 1 Vox Pathfinder mods 11-12-2008, 02:45 AM Just used some spare change to buy a 15 Watt Vox Pathfinder. I also added a bright cap (180pF - like Matchless) and a recylced panel mount 1A fuse holder just because that's how I roll. 022uF - this probably just slowed down the trem speed a bit at the lowest setting. 01uFs also so in the trem circuit I subbed a. Other circuit divergences include a panel mount toggle instead of footswitch for the Tremelo. The trem effect is slightly less deep with the new arrangement as well, but still plenty strong. Definitely more output, cleaner sound, but still provides a bit of grit. While the Vox 5M6 value yielded a cool dark swampy spongy sound, I ended up splitting the difference and using a 2M screen resistor. In comparison, Matchless uses a 1M here for much higher screen voltages and more gain. That amp disappeared shortly after the Pathfinder 15R was introduced. I removed it and replaced it with a hard-to-find NOS Accutronics USA 8EB2C1B (short 3-spring) tank, loosely attached to the amp cab's inside floor with wood screws through four silicone grommets. The screen resistor is a 5M6 on the schematic. This amp was an updated version of the Pathfinder without reverb that was originally introduced by Vox in 1999. tosh: Agreed, the flimsy stock reverb unit in the VOX Pathfinder 15R sounds hissy and not very reverbish. The Vox circuit also used a low gain arrangement on the EF86 which made output relatively low and the tube not sound real clean. The single EF86 just simply can not generate the gain of two triode stages in series like a Champ or a Princeton. My B+ is probably a bit low as the secondary on my PT is 250-0-250 instead of the 270-0-270 referenced on the schematic, but regardless the output is nothing like a champ or the current Vox AC4 buzz machine. It's a single EF86 pentode into the single ended EL84 with a EZ80 rectifier. The real vintage AC4 circuit is nothing like the current vox production.
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